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Across 6. A member of a large group of unicellular microorganisms lacking organelles and an organized nucleus, including some that can cause disease. 7. Exhibiting or characterized by dichotomy. 8. Cause (an animal) to produce offspring, typically in a controlled and organized way 9. The body or system of such names in a particular field: "the nomenclature of chemical compounds". 10. The smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell. 12. Any of a group of unicellular, multicellular, or syncytial spore-producing organisms feeding on organic matter, including molds etc.) 13. The action or fact of carefully choosing someone or something as being the best or most suitable. 15. The action or process of adapting or being adapted. 16. Existing in or caused by nature; not made or caused by humankind. 19. (in an insect or amphibian) The process of transformation from an immature form to an adult form in two or more distinct stages. 22. An individual animal, plant, or single-celled life form. 23. his occurrence of something in different forms, in particular. 24. Based on or characterized by the methods and principles of science. 25. A distinguishing quality or characteristic, typically one belonging to a person. 28. Cause (an egg, female animal, or plant) to develop a new individual by introducing male reproductive material. 30. A change or slight difference in condition, amount, or level, typically with certain limits. 33. Involving, relating to, or emphasizing behavior. 34. Without sex or sexuality, in particular. 35. A diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum 36. A group subordinate to a genus and containing individuals agreeing in some common attributes and called by a common name 38. chemistry) the property of certain substances that enables them to exist in two distinct crystalline forms. 39. A series of events that are regularly repeated in the same order 40. (protist) free-living or colonial organisms with diverse nutritional and reproductive modes. 41. Relating to the instincts, physiology, and activities connected with physical attraction or intimate contact between individuals. 42. (of a living organism) Regrow (new tissue) to replace lost or injured tissue.

Down 1. A mature haploid male or female germ cell that is able to unite with another of the opposite sex in sexual reproduction to form a zygote. 2. The disguising of military personnel, equipment, and installations by painting or covering them to make them blend in with their surroundings. 3. The paired respiratory organ of fishes and some amphibians, by which oxygen is extracted from water flowing over surfaces. 4. He process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. 5. An activity or purpose natural to or intended for a person or thing. 11. An etching tool 14. The immature form of an insect 17. (of an animal or plant) spend the winter in a dormant state. 18. A range of different things 20. The arrangement of and relations between the parts or elements of something complex. 21. Made or produced by human beings rather than occurring naturally, typically as a copy of something natural. 26. The highest category in taxonomic classification 27. Develop gradually, esp. from a simple to a more complex form. 29. (of an animal, typically a bird or fish) Move from one region to another. 31. One of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome. 32. A threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form Characteristic: A feature or quality belonging typically to a person, place, or thing and serving to identify it. 37. A principal taxonomic category that ranks above class and below kingdom.